President Trump ... impending Brexit ... and now Doctor Who - the world as we know it is a-changing.

Who will morph into our beloved time-travelling doctor next? Grab your sonic screwdriver and join us in a journey as we speculate on the next TARDIS resident.

Scottish actor Peter Capaldi confirmed yesterday that he will be stepping down from the iconic role after the next series.

And now the chase is on to find his successor to become the 13th Doctor in the programme's 53-year history.

Bookies at William Hill have offered former Doctors Christopher Eccleston, David Tennant and Matt Smith at respective odds of 33/1, 20/1 and 16/1, while Harry Potter stars Daniel Radcliffe and Rupert Grint are tipped at 33/1 and 8/1 each.

Ben Whishaw is tipped for the role (Image: Sony Pictures)

But it's James Bond star Ben Whishaw who's looking the most likely right now, with William Hill spokesman Rupert Adams saying: "Ben looks a banker at the minute but there is a little bit of cash about for a return of a former Doctor."

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Idris Elba's work elsewhere is also likely to play a part - especially as he's linked to potentially playing the next James Bond.

Aside from those two, Ben Whishaw tops the pile as the best of the rest. He's followed by Miranda Hart and Richard Ayoade.

What's the average actor's age?

Matt Smith was the youngest Doctor to date (Image: BBC)

Forty-one is the average age actors start as the Doctor.

Current Doctor Who, Peter Capaldi, was 55 when he began filming the role - making him the joint oldest in the history of the show. He's tied with the first-ever Doctor, William Hartnell.

Matt Smith was the youngest actor to step onto the set at just 27.

Of our list of hopefuls, bookies' favourite Ben Whishaw is 35 at the moment, so would be 36 by the time the part arrived - the same age as eighth Doctor Paul McGann was when he got the job.

Richard Ayoade would be 39, Rory Kinnear 38 and Miranda Hart 44. Hollywood's Idris Elba would be 44, while Helena Bonham Carter would have turned 50 - the same age third Doctor John Pertwee was when he got the job.

Is it time for a woman to take the lead?

David Tennant and Elisabeth Sladen starred in The Sarah Jane Adventures (Image: BBC)

Joanna Lumley played 'The Female Doctor' in a 1999 Red Nose Day spoof called The Curse of Fatal Death, which was written by Steven Moffat.

The same skit featured big names playing various versions of the Time Lord. Rowan Atkinson, Richard E Grant, Jim Broadbent and Hugh Grant all featured.

Female characters have traditionally played the Doctor's brave side-kicks, and one of the best known was Sarah Jane (played by the late Elisabeth Sladen, below). She originally starred opposite Jon Pertwee and then Tom Baker, before returning for a cameo during David Tennant's tenure.

Her return proved so popular BBC bosses commissioned her to star in the Doctor Who spin-off The Sarah Jane Adventures from 2007.

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So...we believe the next Doctor Who will be played by....

Miranda Hart would be a brilliant choice for Doctor Who (Image: BBC)

Yes, Miranda Hart gets our vote as the next Doctor Who. She's almost the perfect age, the bookies fancy her as second favourite female and she has a lot of experience being surrounded by doctors in TV's Call the Midwife .

Miranda is also the top-searched UK female star on our list and she's a fan of wearing Doctor Who-style scarves, as shown below.

The comic also topped a fan poll the last time a new Doctor needed to be found, beating former show favourite Billie Piper to the top spot.

Miranda is no stranger to a Whovian scarf (Image: BBC)

After being told fans wanted to see her in the TARDIS, she told Heat: "Really? Who, me? Are you serious? That's hilarious!

"I didn't watch it when I was younger - it scared me. I started watching some Doctor Who recently on my own and got too scared. I had to watch it in the daytime - I'm pathetic.

"I might be alright if I'm in it, though, and I don't have to watch it."